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Melittin, deuteromethylated on each of the four amino groups (Gly-1 N alpha and Lys-7, 21, and 23 N epsilon), was prepared by reductive methylation using deuteroformaldehyde and NaBD3CN. Deuterium NMR spectra were obtained for the modified peptide (D-melittin) bound to phospholipid bilayers and erythrocyte ghosts. D-Melittin at 4 mol% (peptide:lipid) induced reversible transitions between extended bilayers and micelles at the phase-transition temperature in dimyristoylphosphatidylcholine (DMPC) bilayers. These changes in lipid morphology did not occur at 1 mol% D-melittin: DMPC and the peptide was highly motionally restricted in gel in gel-phase lipid.

Type

Journal article

Journal

FEBS Lett

Publication Date

22/06/1987

Volume

218

Pages

173 - 177

Keywords

Bee Venoms, Chemical Phenomena, Chemistry, Physical, Deuterium, Dimyristoylphosphatidylcholine, Erythrocyte Membrane, Lipid Bilayers, Magnetic Resonance Spectroscopy, Melitten, Methylation, Micelles, Phospholipids